This just the direct and short answer to this question your comment speak volume I'm heart. That reminds me when I was in primary school our English teacher told us that any thing one is taking from another place which is not person work must be in quote, referencing your source is very important it make people no that actually your not the rightful own but only slighted the work, this is different from copying and paste as long the quote is involved it already tell the reader you got the work from another source. And such is permitted in why writing a book or any publication quoting is never a crime or plagiarism .